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Catalytic role of Ti dopant in boehmite for the photodegradation of rhodamine B

Abstract

Ti(IV) ions were introduced into the layered aluminum hydroxides via the precipitation of Al(NO3)3 solution and Ti(C2H5)4. Catalyst texture and structure were examined by physical techniques: X-ray diffraction, FTIR, SEM, TEM, nitrogen adsorption. Ti(IV) ions were isomorphously substituted for Al(III) species in the boehmite structure in spite of existence of a small amount of amorphous titanium oxide in some cases. The obtained catalysts have layered structure and oblate-shaped platelets with high external surface areas. They were tested for the degradation of rhodamine B (RhB) with air as an oxidant. The intra- and extra-lattice Ti(IV) ions expressed different reaction pathways for the photodegradation of RhB. While octahedrally coordinated Ti(IV) ions in hydroxide layers performed the fast de-ethylation/N-de-ethylation of RhB via consecutive steps, the extra-lattice titanium moieties underwent the slow destruction of chromophores of organic molecules. The Ti-doped boehmite catalysts gave a higher decolorization rate and a better activity in the photodegradation of RhB. The removal efficiency of RhB was obtained at 99% on Ti-intercalated layered hydroxide with molar ratio of Ti/Al = 1/5. The catalysts also expressed a good stability under reaction conditions.

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Acknowledgements

This research is funded by Vietnam National Foundation for Science and Technology Development (NAFOSTED) under Grant No. 104.05-2017.04.

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Correspondence to Nguyen Tien Thao.

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Thao, N.T., Hoan, D.M. Catalytic role of Ti dopant in boehmite for the photodegradation of rhodamine B. Res Chem Intermed 46, 429–443 (2020). https://doi.org/10.1007/s11164-019-03958-2

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Keywords

  • Photodegradation
  • Layered hydroxides
  • Boehmite
  • Promotion
  • Ti dopant